ocfs2: don't unconditionally pass LVB flags

Allow a lock type to specifiy whether it makes use of the LVB. The only type
which does this right now is the meta data lock. This should save us some
space on network messages since they won't have to needlessly transmit value
blocks.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

Author: Mark Fasheh

fs/ocfs2/dlmglue.c

@@ -135,6 +135,11 @@ struct ocfs2_lock_res_ops {
  */
 #define LOCK_TYPE_REQUIRES_REFRESH 0x1
 
+/*
+ * Indicate that a lock type makes use of the lock value block.
+ */
+#define LOCK_TYPE_USES_LVB		0x2
+
 typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
 static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
 				      struct ocfs2_lock_res *lockres,
@@ -150,7 +155,7 @@ static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
 static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
 	.get_osb	= ocfs2_get_inode_osb,
 	.unblock	= ocfs2_unblock_meta,
-	.flags		= LOCK_TYPE_REQUIRES_REFRESH,
+	.flags		= LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
 };
 
 static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
@@ -870,6 +875,9 @@ static int ocfs2_cluster_lock(struct ocfs2_super *osb,
 
 	ocfs2_init_mask_waiter(&mw);
 
+	if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
+		lkm_flags |= LKM_VALBLK;
+
 again:
 	wait = 0;
 
@@ -937,7 +945,7 @@ static int ocfs2_cluster_lock(struct ocfs2_super *osb,
 		status = dlmlock(osb->dlm,
 				 level,
 				 &lockres->l_lksb,
-				 lkm_flags|LKM_CONVERT|LKM_VALBLK,
+				 lkm_flags|LKM_CONVERT,
 				 lockres->l_name,
 				 OCFS2_LOCK_ID_MAX_LEN - 1,
 				 ocfs2_locking_ast,
@@ -2212,11 +2220,15 @@ static int ocfs2_drop_lock(struct ocfs2_super *osb,
 {
 	enum dlm_status status;
 	unsigned long flags;
+	int lkm_flags = 0;
 
 	/* We didn't get anywhere near actually using this lockres. */
 	if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
 		goto out;
 
+	if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
+		lkm_flags |= LKM_VALBLK;
+
 	spin_lock_irqsave(&lockres->l_lock, flags);
 
 	mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
@@ -2266,7 +2278,7 @@ static int ocfs2_drop_lock(struct ocfs2_super *osb,
 
 	mlog(0, "lock %s\n", lockres->l_name);
 
-	status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK,
+	status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
 			   ocfs2_unlock_ast, lockres);
 	if (status != DLM_NORMAL) {
 		ocfs2_log_dlm_error("dlmunlock", status, lockres);